semipublic vs public

semipublic is not a noun while public is a noun.

Word	Noun	Adjective	Verb	Adverb
semipublic	No	Yes	No	No
public	Yes	Yes	No	No

semipublic (noun)	public (noun)
	people in general considered as a whole
	a body of people sharing some common interest

semipublic (adjective)	public (adjective)
having some of the features of public institution	not private; open to or concerning the people as a whole
	affecting the people or community as a whole